Monday, 8 January 2018

Casting a $20 Million Mirror for the World’s Largest Telescope

quote [ The glass arcs that will let astronomers peer back millions of years are decades in the making ]

Interesting to see how much work goes into a mirror
[SFW] [science & technology] [+10 Interesting]
[by satanspenis666@4:53amGMT]

Comments

midden said @ 6:06am GMT on 8th Jan [Score:2]
Most of the technology in this video was actually developed over ninety years ago for the 200 inch Hale telescope at the Palomar Observatory. Granted, the individual segments of this one are almost twice as big as what they could manage back then, but Corning figured out the whole process and has been refining it ever since. The story is well told in one of my favorite tech history books, The Perfect Machine: Building the Palomar Telescope.

https://www.amazon.com/Perfect-Machine-Building-Palomar-Telescope/dp/0060926708
damnit said @ 5:05am GMT on 8th Jan [Score:1 Good]
I hope they captured the creation process and feature it on a How It's Made future episode.

Or better yet, an Impossible Engineering episode.
cb361 said @ 9:30am GMT on 8th Jan [Score:1 Funsightful]
How to they stop large void-demons from escaping through it?
midden said[1] @ 5:16pm GMT on 8th Jan
These are made of Pyrex (seriously), so it's not usually a problem.

https://en.wikipedia.org/wiki/Pyrex
cb361 said @ 5:19pm GMT on 8th Jan
Words spoken by somebody who has never had a large pyrex-demon in their kitchen, knocking over milk bottles and scaring the cat.
midden said @ 5:21pm GMT on 8th Jan [Score:1 Insightful]
I did say, "usually."
buckaroo50 said @ 10:46pm GMT on 27th Feb
Unfortunately they sold the Pyrex name and now it's just regular tempered glass, not borosilicate :(

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